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Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore di
Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore di
admin
2017-03-25
48
问题
Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore difficult to isolate definite______in the evolution of species.
选项
A、fluctuations
B、manifestations
C、predispositions
D、milestones
答案
D
解析
本题考查名词辨析。A项“波动,变动,起伏现象”;B项“显示,表现”;C项“倾向,素质,易染病体质”;D项“里程碑,时间表”。句意为:某些生物学家指出,每种特定的人类特征都是逐渐地、不规则地产生的,因此,很难分离出物种进化过程中明确的(重大标记)。因此答案为D选项。
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